As a thick grey haze shrouded the city on Monday, leaving Delhiites gasping for clean air, pollution data suddenly disappeared from official platforms for most of the day.

पिछले साल की तुलना में इस बार पराली के कारण होने वाली घटनाएं कम हुईं, लेकिन हवा में प्रदूषण में आश्चर्यजनक रूप से उछाल आया है

Delhi's air quality hit a season high of 391 AQI, with 24 stations reporting 'severe' levels; inconsistencies raise concerns over data accuracy.

Delhi's air quality hit a season high of 391 AQI, with 24 stations reporting 'severe' levels; inconsistencies raise concerns over data accuracy.

According to data from the Central Pollution Control Board, while Delhi’s air quality index stood at around 370 (‘very poor’), Gurgaon's was at 238 (‘poor’) thanks to winds and terrain easing pollution there.

Concerns are mounting over the accuracy of Delhi's air quality monitoring as ground checks reveal questionable practices.

As smog thickens in Delhi and people complain of burning eyes, scratchy throats and breathing problems, are the official air quality monitors accurately reflecting the capital’s air quality?

ThePrint analysed PM2.5 data from all 39 AQI stations across the capital for the month of October and found some glaring gaps.

Delhi's nitrogen dioxide levels have soared to three times the safe limit, contributing to a worsening air quality crisis amid hazardous PM2.5 and PM10 levels.

Delhi's nitrogen dioxide levels have soared to three times the safe limit, contributing to a worsening air quality crisis amid hazardous PM2.5 and PM10 levels.

Central Pollution Control Board data show concentrations of the dangerous gas peaking at IGI Airport and ITO; experts warn of increased respiratory risks.

Delhi woke up to a thick grey haze as AQI soared to 311 — a sharp rise from 202 the previous day. Experts blame smoke from Punjab’s stubble fires, firecrackers, and stagnant local emissions trapped by calm winds and falling temperatures.

Persistent cold northwesterly winds were expected to dip the mercury by 1-2°C over the weekend in the national capital and make nights colder

Air pollution levels in Delhi surged by more than 100 points on the Air Quality Index (AQI) on Thursday as smoke from farm fires in Punjab and firecrackers burst overnight combined with local emissions, calm winds, and falling temperatures to blanket the city in thick haze.

The grey haze that descended late on Wednesday persisted through Thursday morning, as pollution made eyes water, throats scratchy and skin itchy

रोहतक में प्रदूषण का स्तर लगातार बढ़ता जा रहा है। गुरुवार शाम जिले का एक्यूआई 357 तक पहुंच गया, जो दिल्ली के आनंद विहार (305) से भी ज्यादा रहा। सिर्फ 24 घंटों में ही प्रदूषण में 109 अंकों की बढ़ोतरी दर्ज की गई। वाहनों और औद्योगिक इकाइयों से निकलने वाले धुएं के कारण शहर की हवा लगातार खराब हो रही है। विशेषज्ञों के अनुसार, तापमान में गिरावट के साथ प्रदूषण और बढ़ने की आशंका है।

The Haryana Pollution Control Board's data for 28 cities, including Rohtak, has raised questions about its accuracy. Despite monitoring pollution levels, concerns have been raised about the reliability of the figures, especially regarding air quality in rural areas. Authorities are under scrutiny for not addressing these issues properly.

The Decision Support System (DSS), which estimates how much different sources contribute to Delhi’s PM 2.5 levels, last provided data on Friday

The Decision Support System (DSS), which estimates how much different sources contribute to Delhi’s PM 2.5 levels, last provided data on Friday

Delhi’s air quality has deteriorated sharply over the past week, with the Air Quality Index (AQI) remaining in the ‘severe’ category for several days. TOI looks at some of the measures in place and how effective they are in the fight against pollution.